E: Amy, contemplate this: imagine you had a serious illness that affected you horribly on a regular basis; something that other people found absolutely repulsive, to the point where they would consciously avoid you if they knew, perhaps even have you expelled from school. Would you tell the one person you wanted to see you at your best?

E: He didn't tell them, remember? They found out, just like you, and he decided he couldn't lie anymore. And Amy, I'm not trying to make you feel bad, but those three's reaction was to learn, illegally, how to become animagi so they could support him.